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【转】VxWorks BSP config.h文件注解

target/all/
config.h

/*
This file contains the configuration parameters for the CPU evaluation board.
*/

#ifndef INCconfigh
#define INCconfigh

/* BSP version/revision identification, before configAll.h */
#define BSP_VER_1_2 1
#define BSP_VER_1_1 1
#define BSP_VERSION "1.2" /* A Tornado 2.0 BSP */
#define BSP_REV "/3" /* 0 for first revision */

#include "configAll.h"        /* 这个文件定义了VxWorks所有的缺省设置 */


/*
* Define ONE of the following to specify the revision of the PPC405GP chip
* you are using. Undefine all others. sysModel() will return
* "Unknown processor" if the correct selection is not made.
*/

/*
* Default boot line
*/

/*

解释: 这一行对配置网络,连通Target Server及下载调试程序非常重要

DEFAULT_BOOT_LINE 的原意是为没有NVRAM的target设计的,这样用户就不需要在每次系统启动是手工输入这些参数了.

系统启动网络时xxxEndLoad()会解释这一行并按这一行的定义进行加载.

Emac(0,0) : 启动设备,可是是软盘,硬盘,PCMCIA卡等 其他的设备名称如:

fd为软盘,(0,0)表示第一个软驱,3.5寸盘.
dc则表示从DEC 21x4x 芯片启动,即系统有NVRAM存在,这种方式现在已不采用.
elpci表示启动设备为3COM EtherLink XL PCI网卡.
fei:Intel 82559 EtherExpress网卡.
ene: NE2000网卡
ELT: 3COM以太网卡
EEX: Intel网卡
ata: ATA/IDE 硬盘 ............

405GP: 主机名
vXworks 从主机加载的VxWorks文件
h=172.16.1.159   主机的IP地址    

e=172.16.254.52 目标机的IP地址,若网络启动Target Server时,这个IP必须和主机上Target Server配置的Target IP地址一致,且设置Back End选项为wdbrpc
u=xxx  用户名，pw=xxx  密码: 若通过网络加载调试时,主机的Ftp服务器和目标机的用户名和密码必须相同
tn=vxTarget 目标机名称

*/

#define DEFAULT_BOOT_LINE \
        "Emac(0,0)405GP:vxWorks h=172.16.1.159 e=172.16.254.52 \
                u=xxx pw=xxx tn=vxTarget"

/*
* 内存设置.
* 如果定义了LOCAL_MEM_AUTOSIZE则SDRAM的大小会在Boot时指定
*/

#undef LOCAL_MEM_AUTOSIZE                    /* 运行时内存大小 */
#define LOCAL_MEM_SIZE 0x02000000            /* 32MB 内存缺省 */
#define LOCAL_MEM_LOCAL_ADRS 0x00000000     /* 内存基地址为 0 */
#define USER_RESERVED_MEM 0                  /* see sysMemTop() */

/*
* Define SDRAM_ECC_ENABLE to enable ECC if an ECC SDRAM DIMM is detected
* during SDRAM auto-configuration. If not defined, ECC will not be enabled
* if an ECC SDRAM DIMM is detected, and the DIMM will be used as a normal DIMM.
*/

#undef SDRAM_ECC_ENABLE

/* 解释: 这里主要设置系统的内存分配定义,若分配不当,则系统不能正常加载和运行.

ROM_TEXT_ADRS, ROM_SIZE, RAM_HIGH_ADRS, 和RAM_LOW_ADRS 在config.h和Makefile文件中都要定义,且必须要保持一致,这些地址的定义一定要参照VxWorks 加载执行过程,硬件手册,MMU和VxWorks的大小进行.主要原则是保证VxWorks image 在ROM和RAM中都要有一定的运行空间且高效运行,可参见 VxWorks BSP和启动过程.

*/
#define ROM_BASE_ADRS 0xfff80000                  /* ROM的基地址 */
#define ROM_TEXT_ADRS (ROM_BASE_ADRS + 0x100)    /* 程序指针和堆栈指针 */
#define ROM_WARM_ADRS (ROM_TEXT_ADRS+0x0004)     /* 热启动入口地址 */
#define ROM_SIZE 0x0007f000                       /* ROM大小 512KB */
#define RAM_LOW_ADRS 0x00010000                   /* RAM 低地址运行 vxWorks */
#define RAM_HIGH_ADRS 0x00C00000                  /* RAM 高地址存储 bootrom */
#define USER_RESERVED_MEM 0                       /* 用户保留地址 */

/*
* Cache options    定义缓存
*/

#define INCLUDE_CACHE_SUPPORT

#define USER_D_CACHE_ENABLE
#define USER_I_CACHE_ENABLE
#undef USER_D_CACHE_MODE
#define USER_D_CACHE_MODE (CACHE_COPYBACK)


/*
* 405 timers (PIT, FIT, WDT) 可由外部时钟驱动或者CPU驱动
*/

#define TIMER_CLOCK_EXTERNAL

/*
* Optional timestamp support
*/

#undef INCLUDE_TIMESTAMP

/*
* Auxilliary Timer rates    定义辅助计时器频率
*/

#ifdef TIMER_CLOCK_EXTERNAL
#define AUX_CLK_RATE_MIN (EXT_TIMER_CLK_FREQ / (1 << 21) )
#define AUX_CLK_RATE_MAX (EXT_TIMER_CLK_FREQ / (1 << 9) )
#define AUX_CLK_RATE_DEFAULT (EXT_TIMER_CLK_FREQ / (1 << 17) )
#else

/* ZZZZZZZZZZZ todo put rates in for system clock derived timer clock */

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